Chain Dynamics and Glass Transition of Dry Native Cellulose Solutions in Ionic Liquids

Dry native cellulose solutions in 1-butyl-3-methylimidazolium methylphosphonate (EMImMPO3H), 1-butyl-3-methylimidazolium acetate (EMImAc), and 1-butyl-3-methylimidazolium chloride (BMImCl) ionic liquids (IL) were investigated using subambient linear viscoelastic oscillatory shear. Glass transition temperatures (Tg) of solutions with various cellulose concentrations up to 8.0 wt.% were observed as the peaks of loss tangent and loss modulus 𝐺" in descending temperature sweeps at 1 rad/s. Cellulose/IL solutions showed a minimum in Tg at ~2.0 wt.% cellulose content before increasing with cellulose concentration, suggesting a perturbation of the strongly structured IL solvents by the cellulose chains. Isothermal frequency sweeps in the vicinity of Tg were used to construct time-temperature-superposition master curves. The angular frequency shift factor as a function of temperature indicates Arrhenius behavior within a 9 K range near Tg, allowing calculation of fragility, which was found to be constant up to 8.0 wt.% cellulose concentration. This result implied that increasing cellulose concentration initially decreases Tg due to disrupted ionic regularity of ILs, but does not seem to change their fragility.



Work Title Chain Dynamics and Glass Transition of Dry Native Cellulose Solutions in Ionic Liquids
Open Access
  1. Ralph Colby
License Public Domain Mark 1.0
Work Type Article
Publication Date 2020
Publisher Identifier (DOI)
  1. 10.1039/C9SM01587F
Deposited February 25, 2021




This resource is currently not in any collection.

Work History

Version 1

  • Created
  • Added Creator Ralph Colby
  • Added CelluloseTg.pdf
  • Updated Publication Date, License Show Changes
    Publication Date
    • 2020
  • Published
  • Updated